PrepTest 117, Section 1, Question 15
The survival of nerve cells, as well as(453 more words not shown)
Which one of the following(9 more words not shown)
- ALevi-Montalcini's discovery of(34 more words not shown)
- BLevi-Montalcini's discovery of(36 more words not shown)
- CNGF, which is(31 more words not shown)
- DPartly as a(43 more words not shown)
- ENGF, a chemical(40 more words not shown)
Reading the passage
We've already predicted that discovering NGF was an important advance, and we've followed both the discovery and the substance's role in nerve development and survival. We want some version of that whole idea. Chick embryos helped reveal NGF; they aren't the ultimate subject of the discovery's significance.
Working the answers
- A
This narrows the contribution to understanding chick embryos. Those embryos are part of the experiments, but the account develops a broader understanding of nerve development and survival.
- BCorrect
This combines the importance of the discovery with what NGF does: stimulate development and help determine whether particular nerve cells survive. That matches both halves of our prediction.
- C
This sounds close because it mentions NGF, survival, and tissue culture. But it adds that Levi-Montalcini devised the technique. We're told she used a then-new technique, not that she invented it. It also misses the account's emphasis on the discovery as a major advance.
- D
The restriction to tissues where nerves are already connected is unsupported. Developing nerves receive NGF from cells to which they will form connections, and sometimes from nearby supporting cells.
- E
This extends the survival claim to the organism's entire life and makes antibodies the sole exception. The final sentence is limited to certain periods of development and also identifies absence of NGF as a danger. E overstates what we've learned.
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